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| Dyno questions.... http://forum.44cup.com/viewtopic.php?f=7&t=594 |
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| Author: | GregF [ Mon Dec 06, 2010 7:42 pm ] |
| Post subject: | Dyno questions.... |
We are getting ready to make a bunch of Pre-Season dyno runs and I have some questions... 1. When tested at an event is it just one pull and off or several runs? 2. What correction factor is used? ( there are 6 or 7 choices on a Dynojet 248) 3. Last year we used just temp and atmosphere correction, and we had numbers that seem close to the 144hp limit. Today I went to the dyno with a car with a fresh engine and learned the following: Uncorrected HP 141.2, atmo/temp correction 138.1hp, SAE correction 134.0hp. Tell me which one we are all tuning to.... Greg F |
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| Author: | #69 [ Mon Dec 06, 2010 9:32 pm ] |
| Post subject: | Re: Dyno questions.... |
I think it is SAE but have been away to long KT |
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| Author: | Director [ Mon Dec 06, 2010 11:02 pm ] |
| Post subject: | Re: Dyno questions.... |
Yes, SAE. 3 pulls, using the highest recorded value for HP and TQ. |
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| Author: | tim pruitt [ Tue Dec 07, 2010 3:32 pm ] |
| Post subject: | Re: Dyno questions.... |
What smoothing factor? |
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| Author: | GregF [ Tue Dec 07, 2010 6:43 pm ] |
| Post subject: | Re: Dyno questions.... |
Jeez, using SAE I have a lot of work to do.... Greg ( btw, I have been using 5 as the smoothing factor to get readable results.) |
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| Author: | johntorg [ Tue Dec 07, 2010 10:23 pm ] |
| Post subject: | Re: Dyno questions.... |
Here are the GTS rules with a smoothing factor of 4. It would be nice to use the same Dynos, Correction and factor, since some of us run in both series. ". Competitors must use a Dynojet brand of dyno for certification, and all compliance runs at events will be made on a Dynojet Model 248, 224, or 424 in SAE mode with a smoothing factor of 4 so it is highly recommended to use one of those dynos with those settings for certification to avoid any errors in classification. To allow a small safety margin for dyno variance, a forgiveness of 4WHP will be given to cars with WHP greater than WTQ and a -4 factor will be applied to the formula for cars using the averaging method for WTQ greater than WHP" |
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| Author: | Director [ Tue Dec 07, 2010 10:44 pm ] |
| Post subject: | Re: Dyno questions.... |
SF of 4 is fine. |
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